Method for 3D printing of terahertz modulation material with gradient modulation amplitude based on laser sintering

Abstract

The invention provides a method for 3D printing of a terahertz modulation material with gradient modulation amplitude based on laser sintering, which comprises the following steps: mixing and banburying high-conductivity metal superfine powder and low-viscosity polymer powder, and conducting grinding and crushing in a millstone type mechanochemical reactor to obtain metal / low-viscosity polymer composite superfine powder; and after the metal / low-viscosity polymer composite superfine powder is mixed with 3D printable polymer powder, conducting molding by using a laser sintering 3D printing technology to prepare the terahertz modulation material of which the solid thickness is linearly increased. The terahertz modulation material shows the content change of the high-conductivity metal ultrafine powder at different thicknesses through the thickness change, so that the terahertz modulation intensity in gradient distribution is realized on the same material, the terahertz modulation site with the required fixed intensity can be obtained through a test in the later period, and the terahertz modulation material has the characteristics of simplicity in operation and lower cost, and the prepared terahertz modulation material can achieve terahertz wave modulation with the intensity amplitude of 0.2-0.8.

Description

technical field [0001] The invention belongs to the technical field of terahertz modulation, and relates to a method for 3D printing a terahertz modulation material with gradient modulation amplitude based on laser sintering. Background technique [0002] Terahertz waves cover a wide bandwidth from microwave to infrared spectral region (30-3000 μm), and have great application prospects in imaging, high-bandwidth communication, radar and other fields. The development of dynamic terahertz devices is fundamental for applications, including switching, modulation, and phase shifting. These functions are usually achieved by doping functional materials with controllable optical or electrical parameters such as semiconductors, liquid crystals, two-dimensional materials, perovskites, and phase-change materials. [0003] Terahertz intensity modulator is a key component of manipulating terahertz signal transmission system, and its related research is of great significance to the furth...

AI Technical Summary

Problems solved by technology

At present, electronically and optically controlled terahertz intensity modulators based on semiconductors such as silicon and phase change materials such as vanadium dioxide have many disadvantages: 1. The resonant circuit of the electronically controlled terahertz intensity modulator has large capacitance and series resistance , the on-discharge requires a certain time delay, resulting in a relatively slow modulation speed of the modulator; and conductive electrodes (such as conductive silicon, etc.) are required on the upper and lower surfaces of the electronically controlled terahertz wave modulator to realize the electronically controlled modulator

[0006] However, for the terahertz intensity modulator, how to stably obtain the terahertz modulation wave with the required fixed intensity is the fundamental purpose. Although the metal / polymer-based hybrid material also has the function of terahertz modulation, its precise modulation intensity The degree and consistency performance is very poor. Even if the same process is used, the modulation intensity of metal / polymer-based modulation plates prepared in different batches will be deviated due to errors in the preparation process and natural random factors.

On the other hand, its modulation intensity usually cannot pass the test data of the prepared finished product, so that the preparation process conditions of other modulation intensities can be obtained by reverse reasoning, which makes it necessary to go through a large number of repeated Although the cost of the material itself is low, the cost of exploring the process conditions is too high, so there is no relevant report on the preparation of terahertz modulation materials using metal / polymer-based hybrid materials in the prior art